Răspuns :
a-b=626
a=626+b
a+a+b=7b
626+b+626+b+b=7b
1252+3b=7b
7b-3b=1252
4b=1252
b=1252:4
b=313
a=313+626
a=939
a=626+b
a+a+b=7b
626+b+626+b+b=7b
1252+3b=7b
7b-3b=1252
4b=1252
b=1252:4
b=313
a=313+626
a=939
a-b = 626 ⇒ a = 626+b
a+a+b = 7*b
626+b+626+b+b = 7b
1252+3b = 7b
1252 = 7b-3b
1252 = 4b
b = 1252:4
b = 313
a = 626+b
a = 626+313
a = 939
a+a+b = 7*b
626+b+626+b+b = 7b
1252+3b = 7b
1252 = 7b-3b
1252 = 4b
b = 1252:4
b = 313
a = 626+b
a = 626+313
a = 939